HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
London

$481+ Cheap flights from Islip, NY (ISP) to London (LON)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/18. Fares are subject to change and may not be available on all flights or dates of travel.
ISP — LON
Jun 16 — Jun 231
Tue 6/16
Tue 6/23
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Islip to London with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Islip to London

Cheapest flights from Islip to London
Explore the most affordable flight options available from Islip to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 17, 2026.

This Kiwi.com deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/119:52 pm
ISP
-
LGW
1 stop31h 08m
Multiple Airlines
Wed 6/172:00 pm
LGW
-
ISP
1 stop35h 57m
Multiple Airlines
Deal found 5/15$912
This Kiwi.com deal was found by Cheapflights users on 5/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/199:52 pm
ISP
-
LGW
1 stop31h 08m
Multiple Airlines
Sun 6/282:00 pm
LGW
-
ISP
1 stop35h 57m
Multiple Airlines
Deal found 5/14$999
This Kiwi.com deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/299:52 pm
ISP
-
LGW
1 stop31h 08m
Multiple Airlines
Mon 7/62:00 pm
LGW
-
ISP
2 stops31h 47m
Multiple Airlines
Deal found 5/15$1,175
This Kiwi.com deal was found by Cheapflights users on 5/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/138:43 pm
ISP
-
LGW
2 stops32h 17m
Multiple Airlines
Tue 7/212:00 pm
LGW
-
ISP
1 stop24h 58m
Multiple Airlines
Deal found 5/14$1,201
This Kiwi.com deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/299:52 pm
ISP
-
LGW
1 stop31h 08m
Multiple Airlines
Sun 7/52:00 pm
LGW
-
ISP
1 stop24h 58m
Multiple Airlines
Deal found 5/15$1,226
This FlightHub deal was found by Cheapflights users on 5/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/136:00 am
ISP
-
LHR
2 stops33h 45m
JetBlue
Tue 7/218:15 am
LHR
-
ISP
2 stops44h 02m
JetBlue
Deal found 5/14$1,445
This Mytrip deal was found by Cheapflights users on 5/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/177:25 am
ISP
-
LHR
2 stops18h 05m
Multiple Airlines
Sun 5/249:30 am
LHR
-
ISP
2 stops15h 15m
Multiple Airlines
Deal found 5/12$1,484
This Expedia deal was found by Cheapflights users on 5/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/1111:30 am
ISP
-
LHR
2 stops21h 00m
Multiple Airlines
Wed 6/178:50 am
LHR
-
ISP
2 stops30h 50m
Multiple Airlines
Deal found 5/14$1,485
This FlightHub deal was found by Cheapflights users on 5/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/193:07 pm
ISP
-
LHR
2 stops48h 38m
JetBlue
Sun 6/288:40 am
LHR
-
ISP
2 stops58h 32m
JetBlue
Deal found 5/14$1,549
This Mytrip deal was found by Cheapflights users on 5/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/195:29 pm
ISP
-
LHR
3 stops34h 06m
Multiple Airlines
Sun 6/286:50 am
LHR
-
ISP
3 stops19h 09m
Multiple Airlines
Deal found 5/14$1,645
This Trip.com deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/299:52 pm
ISP
-
LHR
2 stops27h 43m
Multiple Airlines
Mon 7/66:30 am
LHR
-
ISP
2 stops38h 26m
Multiple Airlines
Deal found 5/15$1,651

Find flight deals from Islip to London

Discover tips and strategies to find the most affordable flight options for your journey from Islip (ISP) to London (LON). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 17, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$912
(Kiwi.com)

One-way from

$481
(Kiwi.com)

Popular in

June

Cheapest in

September

Average price

$705
Provider with most accurate pricing for Islip Long Island-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Islip Long Island-London (LON) flights.
Search Deals
From Islip Long Island to London (LON)
Search Deals
One-way flight from Islip Long Island to London (LON)
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($88 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Islip to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 17, 2026.
Use the filters below to find and compare flights from Islip to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Thu 6/11

9:52 pm-10:00 am

1 stop31h 08m

London Gatwick

Wed 6/17

2:00 pm-8:57 pm

1 stop35h 57m

$995

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Mon 6/29

9:52 pm-10:00 am

1 stop31h 08m

London Gatwick

Mon 7/6

2:00 pm-4:47 pm

2 stops31h 47m

$1,175

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Fri 6/26

9:52 pm-10:00 am

1 stop31h 08m

London Gatwick

Fri 7/3

2:00 pm-10:03 am

1 stop25h 03m

$1,177

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Mon 7/13

8:43 pm-10:00 am

2 stops32h 17m

London Gatwick

Tue 7/21

2:00 pm-9:58 am

1 stop24h 58m

$1,201

IslipLondon

ISP - LGW

ISPLGW

Islip Long Island

Wed 6/10

2:55 pm-11:45 am

2 stops15h 50m

London Gatwick

Wed 6/17

3:40 pm-11:35 pm

2 stops36h 55m

$1,462

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 6/29

9:52 pm-7:55 am

1 stop29h 03m

London Heathrow

Mon 7/6

3:15 pm-3:56 pm

2 stops29h 41m

$1,664

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Thu 6/11

10:00 am-7:10 am

1 stop16h 10m

London Heathrow

Wed 6/17

5:35 pm-1:30 pm

1 stop24h 55m

$1,703

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Mon 7/13

10:00 am-7:10 am

1 stop16h 10m

London Heathrow

Tue 7/21

5:35 pm-10:56 am

1 stop22h 21m

$1,818
Quickest round-trip

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Sat 6/27

9:00 am-8:35 am

1 stop18h 35m

London Heathrow

Mon 7/6

8:10 pm-10:56 am

1 stop19h 46m

$1,829

IslipLondon

ISP - LHR

ISPLHR

Islip Long Island

Fri 6/19

7:00 am-8:00 am

1 stop20h 00m

London Heathrow

Sun 6/28

5:40 pm-5:41 pm

1 stop29h 01m

$1,869

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/13

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

Compare providers for flights from Islip to London

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Islip to London in May.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
OvagoPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Islip, New York-London flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Islip, New York-London flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Islip, New York-London flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Islip, New York-London flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Islip, New York-London flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Islip to London

Have a flexible travel schedule? Discover the best time to fly to London from Islip with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Islip to London
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Islip to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Islip to London?

    For a flight from Islip to London, you will be flying from Long Island. Islip Long Island (ISP) is just 7.2 mi from the center of the city. Long Island is the only Islip airport and it handles 0 outbound flights to London per day. 0 airlines have flights to London from Islip Long Island on a regular basis.

  • Can I find deals for flights from Islip to London that include hotel bookings?

    Yes. In addition to deals on Islip to London flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Islip to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Islip to London.

  • Can I find deals for business class flights from Islip to London?

    Yes. Cheapflights offers flight deals from Islip to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Ilford
Hounslow
Winchester
Croydon
Gatwick
Southend-on-Sea
Dorking
Harrow
Eastleigh
Dartford
Dover
Orpington
Watford
Borehamwood
Chipping Norton
Hayes
Kingston upon Thames
Eastbourne
Slough
Sutton

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.